* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    background-color: bisque;
    position: relative;
    overflow: hidden;
}

#water-mark {
    position: absolute;
    z-index: -10;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}